Merge proces, enable signing of the assembly.

Frameworks/MQTTnet.NetStandard/Server/MqttClientDisconnectedEventArgs.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace MQTTnet.Server
+{
+    public class MqttClientDisconnectedEventArgs : EventArgs
+    {
+        public MqttClientDisconnectedEventArgs(ConnectedMqttClient client)
+        {
+            Client = client ?? throw new ArgumentNullException(nameof(client));
+        }
+        
+        public ConnectedMqttClient Client { get; }
+    }
+}